# (ΔU-ΔH)for the formation of NH3from N2and H2 is:

1.  -2 RT

2.  2 RT

3.  RT

4.  1/2RT

4

RT

Explanation :
No Explanation available for this question

# The enthalpy and entropy of a reaction are -5.0kJ mol-1and -20JK-1mol^-1respectively and independent of temperature. The highest temperature upto which the reaction is feasible is

1.  250 k

2.  240 k

3.  275 k

4.  300 k

4

250 k

Explanation :
No Explanation available for this question

# Standard molar enthalpy of formation of CO2 is equal to

1.  Zero

2.  Standard molar enthalpy of combustion

3.  The sum of standard molar enthalpies of formation of CO and O2

4.  The standard molar enthalpy of combustion of carbon ( graphite)

4

The standard molar enthalpy of combustion of carbon ( graphite)

Explanation :
No Explanation available for this question

# The ΔHθfor the reaction, 4S(s)+6O2(g)→4SO3(g) is -1583.2kJ. Standard enthalpy of formation of sulphur trioxide is

1.  -3166.4 kJ

2.  3166.4 kJ

3.  -395.8 kJ

4.  395.8 kJ

4

-395.8 kJ

Explanation :
No Explanation available for this question

# Which of the following is not a state function

1.  Heat

2.  Internal energy

3.  Enthalpy

4.  Entropy

4

Heat

Explanation :
No Explanation available for this question

# When an ideal gas is allowed to expand adiabatically into an evacuted vessel then

1.  ΔS=0

2.  ΔG=0

3.  ΔU=0

4.  ΔP=0

4

ΔU=0

Explanation :
No Explanation available for this question

# The units of entropy are

1.  Jmol-1

2.  JK-1mol-1

3.  Jg-1

4.  JK mol-1

4

JK-1mol-1

Explanation :
No Explanation available for this question

# All the naturally occurring processes proceed spontaneously in a direction which leads to

1.  Decrease of entropy

2.  Increase of enthalpy

3.  Inc Decrease of free energy

4.  Decrease of free energy

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Decrease of free energy

Explanation :
No Explanation available for this question

# For a process :C(s)+O2(g)CO2(g)↔CO2(g),it is found that ΔG at a given temperature is 40.0kJ mol-1. At this temperature

1.  The system is at equilibrium

2.  CO2 will be formed spontaneously

3.  CO2 will decompose spontaneously

4.  The process is not possible.

4

CO2 will decompose spontaneously

Explanation :
No Explanation available for this question

1.  Fusion

2.  Sublimation

3.  Combution

4.  Vaporisation

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